Effect of Additives on Thermal Decomposition of Phosphogypsum

Abstract:

The effect of different additives on thermal decomposition of phosphogypsum was investigated by means of a thermogravimetry coupled with a Fourier transform infra-red spectroscopy. These additives included C, CaO, Al₂O₃ and S. The temperature of thermal decomposition of phosphogypsum is about 1100~1320°C without any additives under the background of nitrogen. The temperature of the thermal decomposition of phosphogypsum decreased obviously with the addition of CaO, C and S. No influence was found for the thermal decomposition of phosphogypsum with the addition of Al₂O₃. As one of evolved products from the thermal decomposition of phosphogypsum, SO₂ production was discussed.

• Periodical: Advanced Materials Research (Volumes 415-417)
• Pages: 735-740
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.415-417.735
• Online since: December 2011
• Authors: Chang Yan Yang, Yun Wei, Fa Bin Ye, Yi Gang Ding, Yuan Xin Wu
• Keywords: Additive, Phosphogypsum (PG), Thermal Decomposition

References

[1] Hong-yi Jiang，Tao Liu. Study on the Influence of Granding and Impurity Distribution for the Properties of Phosphogypsum.[J] Journal of Wuhan University of Technology, 2004, 26(1):28-30

[2] Wei Zhang, Ping Ning, and Li-ping Ma. Pilot study on reductive decomposition of phosphogypsum with high sulfur coal in a circulating fluidized bed. [J] Modern Chemical Industry, 2009, (1):29

[3] Shaocong Zheng, Ping Ning, and Liping Ma. Reaction Properties of Thermal Decomposition of Phosphogypsum in different Atmospheres. [J] Journal of Wuhan University of Technology, 2010(6):580-583

[4] Hai-ping Xiao, Jun-hu Zhou, and Xin-yu Cao. Experimental Study of Decomposition Behavior of CaSO4 in Different Atmospheres.[J] Power Engineering, 2004,12: 889-892

[5] L M Diaz-Bossio, S E Squier, and A H Pulsifer. Reductive decomposition of calcium sulfate utilizing carbon monoxide and hydrogen. [J] Chem Eng Sci,1985, 40(3):319-324

DOI: 10.1016/0009-2509(85)85094-6

[6] Chengbo Wang. Study on the Decomposition Characteristics of Phosphogypsum. [D] Master Thesis, 2007(5): 39-54

[7] I Gruncharov, Y Pelovski, G Bechev, and I Dambalov. Effect of some admixtures on the decomposition of calcium sulphate. [J] Thermal Anal,1988, 33: 597-602

DOI: 10.1007/bf02138560

[8] DE Patent 3622688. 1988.01.14

[9] Haiping Xiao, Junhu Zhou, Jianzhong and Liu. Kinetics of reaction between CaS and CaSO4 under N2 atmosphere.[J] Journal of Chemical Industry and Engineering(China), 2005,56(7):1322-1326

[10] Naoto Mihara, Dalibor Kuchar, Yoshihiro Kojima, Hitoki Matsuda. Reductive decomposition of waste gypsum with SiO2，Al2O3，Fe2O3 additives[J]. J Mater Cycles Waste Manag, 2007,9:21-26

DOI: 10.1007/s10163-006-0167-4

[11] E M Merwe, C A Strydom and J H Potgieter. Thermogravimetric analysis of the reaction between carbon and CaSO4.2H2O, gypsum and phosogypsum in an inert atmosphere. [J] Thermochinica Acta, 1999, 340-341:431-437

DOI: 10.1016/s0040-6031(99)00287-7

[12] Songlin Zhou, Yaqing Wang. Effect of Additives on the Process of Reductive Decomposition of Phosphogypsum [J]. Bulletin of the Chinese Ceramic Society, 1998(4):19-22